I am always up for a good kid hack. Even if this idea doesn't get them to eat their food, maybe it will keep then entertained long enough so you can eat yours.
From Jake Ludington's MediaBlab site:
To help other people who might run into this same chopsticks problem, I put together a short video on how to make chopsticks for kids. All you need is some of those wooden chopsticks that come in a paper sleeve and a thin rubber band. The video tells the rest of the story.